Goldfish Ji is a lively and active small fish, by chance, it was washed into the glass bottle at high tide. At this time, Sosuke, a boy who happened to be on holiday at the seaside, passed by to help it out of trouble, and the mermaid has known each other ever since. Sosuke took the goldfish home to feed and played together, feeling very strong. As the sailor's father sailed all day, Sosuke had to depend on his mother, which made him withdrawn and autistic, even ignoring his elders. However, after meeting goldfish, Sosuke gradually changed his indifferent attitude towards life, which allowed him to slowly repair the defects in his character. In an unexpected tsunami, Sosuke hit his body, and the goldfish was stained with human blood and floated back to the sea. It turns out that there is another world in the ocean, where there is a strange man who manipulates the hydrological environment, Fujimoto, who has discovered the ugliness of human pollution, so he has created another aquatic world. He found that the goldfish was tainted with popularity and was about to use magic to beat it back to its original shape, but it backfired.
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